data:image/png;base64,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:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAeAAAAFoCAYAAACPNyggAAAOhUlEQVR4Xu3VwQkAAAjEMN1/abewn7jAQRC64wgQIECAAIF3gX1fNEiAAAECBAiMAHsCAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQICLAfIECAAAECgYAAB+gmCRAgQICAAPsBAgQIECAQCAhwgG6SAAECBAgIsB8gQIAAAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECAiwHyBAgAABAoGAAAfoJgkQIECAgAD7AQIECBAgEAgIcIBukgABAgQIHLFxAWmhEwHPAAAAAElFTkSuQmCC

Take any number of input lists, and create a new list containing the items of the input lists. So APPEND [A B] [C D] where the [,,,] are lists reports the list [A B C D] not [[A B] [C D]].

11111

A,B,C,D,FA